Thunderbird will not send emails...but claims they are "sent" (no error message)

Up until the beginning of this month my Thunderbird was working fine with my roadrunner email address. I have not downloaded any new software or made any changes to my settings during this time. Now I can no longer send emails (although it claims they are sent) and I never get an error message. I'm definitely in online mode, can receive all messages fine, and can send messages from my road runner server fine through webmail. I have checked to ensure no firewalls or antiviruses are blocking my outgoing messages and know the SMTP is correct. Please help!

Hi...thanks so much for your help! It says "mail sent successfully" and shows it in my sent folder after I click send.
Troubleshooting:
Application Basics
Name: Thunderbird
Version: 24.4.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
Profile Folder: Show Folder
(Local drive)
Application Build ID: 20140316131045
Enabled Plugins: about:plugins
Build Configuration: about:buildconfig
Crash Reports: about:crashes
Memory Use: about:memory
Mail and News Accounts
account1:
INCOMING: account1, , (pop3) pop-server.tampabay.rr.com:110, plain, passwordCleartext
OUTGOING: smtp-server.tampabay.rr.com:25, plain, none, true
account2:
INCOMING: account2, , (none) Local Folders, plain, passwordCleartext
Extensions
Important Modified Preferences
Name: Value
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.smart_size_cached_value: 358400
extensions.lastAppVersion: 24.4.0
font.internaluseonly.changed: true
font.name.monospace.el: Consolas
font.name.monospace.tr: Consolas
font.name.monospace.x-baltic: Consolas
font.name.monospace.x-central-euro: Consolas
font.name.monospace.x-cyrillic: Consolas
font.name.monospace.x-unicode: Consolas
font.name.monospace.x-western: Consolas
font.name.sans-serif.el: Calibri
font.name.sans-serif.tr: Calibri
font.name.sans-serif.x-baltic: Calibri
font.name.sans-serif.x-central-euro: Calibri
font.name.sans-serif.x-cyrillic: Calibri
font.name.sans-serif.x-unicode: Calibri
font.name.sans-serif.x-western: Calibri
font.name.serif.el: Cambria
font.name.serif.tr: Cambria
font.name.serif.x-baltic: Cambria
font.name.serif.x-central-euro: Cambria
font.name.serif.x-cyrillic: Cambria
font.name.serif.x-unicode: Cambria
font.name.serif.x-western: Cambria
font.size.fixed.el: 14
font.size.fixed.tr: 14
font.size.fixed.x-baltic: 14
font.size.fixed.x-central-euro: 14
font.size.fixed.x-cyrillic: 14
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font.size.fixed.x-western: 14
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font.size.variable.tr: 17
font.size.variable.x-baltic: 17
font.size.variable.x-central-euro: 17
font.size.variable.x-cyrillic: 17
font.size.variable.x-unicode: 17
font.size.variable.x-western: 17
mail.openMessageBehavior.version: 1
mail.winsearch.enable: true
mail.winsearch.firstRunDone: true
mail.winsearch.global_reindex_time: 1386018562
mailnews.database.global.datastore.id: d0565083-6917-4a0a-868f-37bebde1e81
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1398260550
places.history.expiration.transient_current_max_pages: 104808
plugin.importedState: true
plugin.state.npdeployjava: 0
print.printer_Lexmark_X264dn.print_bgcolor: false
print.printer_Lexmark_X264dn.print_bgimages: false
print.printer_Lexmark_X264dn.print_colorspace:
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print.printer_Lexmark_X264dn.print_evenpages: true
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print.printer_Lexmark_X264dn.print_in_color: true
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print.printer_Lexmark_X264dn.print_oddpages: true
print.printer_Lexmark_X264dn.print_orientation: 0
print.printer_Lexmark_X264dn.print_page_delay: 50
print.printer_Lexmark_X264dn.print_paper_data: 1
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Graphics
Adapter Description: Intel(R) HD Graphics
Vendor ID: 0x8086
Device ID: 0x0152
Adapter RAM: Unknown
Adapter Drivers: igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32
Driver Version: 8.15.10.2639
Driver Date: 2-1-2012
Direct2D Enabled: false
DirectWrite Enabled: false (6.2.9200.16571)
ClearType Parameters: ClearType parameters not found
WebGL Renderer: false
GPU Accelerated Windows: 0
AzureCanvasBackend: skia
AzureFallbackCanvasBackend: cairo
AzureContentBackend: none
JavaScript
Incremental GC: 1
Accessibility
Activated: 0
Prevent Accessibility: 0
Library Versions
Expected minimum version
Version in use
NSPR
4.10.2
4.10.2
NSS
3.15.4 Basic ECC
3.15.4 Basic ECC
NSS Util
3.15.4
3.15.4
NSS SSL
3.15.4 Basic ECC
3.15.4 Basic ECC
NSS S/MIME
3.15.4 Basic ECC
3.15.4 Basic ECC

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